Pattern plate with resilient member in cavity



March 8, 1966 R. w. TACCONE 3,238,576

PATTERN PLATE WITH RESILIENT MEMBER IN CAVITY Filed Dec. 4, 1962 UnitedStates Patent 3,238,576 PATTERN PLATE WITH RESILIENT MEMBER IN CAVITYRussell W. Taccone, Erie, Pa., assignor to Taccone Corporation, Erie,Pa., a corporation of Pennsylvania Filed Dec. 4, 1962, Ser. No. 242,3116 Claims. ((31. 2248) This invention relates to molding machines and,more particularly, to molding machines for making sand castings.

This invention is particularly concerned with molds from pattern plateshaving relatively deep pockets formed therein where sand is forced intothese pockets by high pressure or high density molding machines.

As the sand is compressed against the resilient pad placed at the bottomof the pocket, it exerts an upward force which helps break loose thegreen sand pockets during stripping. Without the use of thesecompression pads, the green sand pocket will break off or adhere to thesides and result in a scrap mold.

A solid rubber pad can be used or spring loaded means can besubstituted. Also, inflatable diaphragms can be utilized to help releasethese high density green sand pockets.

It is, accordingly, an object of the present invention to provide animproved pattern plate.

Another object of the invention is to provide a pattern plate incombination with a stripping means therefor.

A further object of the invention is to provide an improved moldingmachine in combination with a pattern plate.

Yet a further object of this invention is to provide a molding machinewhich is simple in construction, economical to manufacture, and simpleand eflicient in operation.

With the above and other objects in view, the present invention consistsof the combination and arrangement of parts hereinafter more fullydescribed, illustrated in the accompanying drawing and more particularlypointed out in the appended claims, it being understood that changes maybe made in the form, size, proportions, and minor details ofconstruction without departing from the spirit or sacrificing any of theadvantages of the invention.

In the drawing:

FIG. 1 is a partial cross sectional view of a molding machine accordingto the invention;

FIG. 2 is a cross section of the machine shown in FIG. 1 with the flaskand mold partly stripped from the pattern plate; and

FIG. 3 is a cross sectional enlarged view of another embodiment of thestripping means.

Now with more particular reference to the drawing, the molding machineshown is of the general type shown in Patent No. 2,698,976. It has apattern plate with a flask -11 supported thereon. The flask 11 issupported below a head 12. The head 12 has a flexible resilientdiaphragm 13 attached thereto by means of an open frame 30 whichsandwiches the diaphragm 13 between the frame 30 and a flange 36. Bolts24 hold the frame 30 and the flange 36 together.

The flasks are supported by means of a bottom flange 22 resting on theuppermost part of flanged wheels 15 which are carried on a conveyor 14.Means is provided for lifting the wheels of the conveyor 14 up with theflask supported thereon to lift the flask from the fixed pattern plate10 and thereby strip the mold from the pattern plate and thereby stripthe sand from the pockets.

Pocket bores 17 have countenbores 16. A rubber block 18 is supported inthe pocket bores 17 by backing plates 20 which are bonded to the rubberblocks and are held in place by studs 19. The pocket bores 27 haveresilient blocks 26 supported therein. Grooves 28 are shown by way ofexample to indicate how various contours of pockets can be made in themold.

During molding, the flasks 11 are carried down the conveyor 14 on thewheels 15. When the flask 11 reaches a position over the pattern plate10, the wheels 15 are lowered to drop the flask 11 onto the patternplate with locating pins 21 extending through proper locating holes inthe flask. Sand is then deposited in the flask 11. The head 12 withframe 30 is then lowered onto an upper flange 23 of the flask. The sand25 is then compressed by means of the diaphragm 13 to force the sandinto the pocket bores 17 and 27. Pressure transmitted from the diaphragm13 to the sand compresses the rubber blocks 18 and 26.

Then when the conveyor wheels 15 are lifted to raise the flask 11 fromthe pattern plate and thereby strip the sand from the pattern, therubber blocks 18 and 26 expand to their original shape and, in so doing,they urge the sand out of the pocket bores. The force of the blocksliterally lifts the sand from the pocket bores, thus preventing the sandprojections from breaking off, which would destroy the mold.

In the embodiment of the invention shown in FIG. 3, a pattern plate isshown in partial cross section with a bore 127 therein and a pocket 116.Thus, when sand is compressed into the pocket 11 6, it will force plate121 down flush with the bottom surface of the bore. Then when the sandmold is stripped, a resilient block 118 will be expanded, urging thesand out of the pocket 1-16. The surface of the sand will be held flatby the Plate 121.

The resilient block 118 is sandwiched between the plates 120 and 121disposed in the bore 127. Studs 119 hold the resilient block 118 inplace.

The foregoing specification sets forth in the invention in its preferredpractical forms but the structure shown is capable of modificationwithin a range of equivalents without departing from the invention whichis to be understood is broadly novel as is commensurate with theappended claims.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. A molding machine comprising a pattern plate having pockets therein,said pattern plate being adapted to support a flask to receive greensand under pressure, said pockets having a resilient member forming apart of the bottom thereof, said resilient member being adapted to bedistorted when said sand is compressed in said flask and said pockets,said resilient member urging said sand from said pockets when said flaskwith said sand therein is removed.

2. A molding machine comprising a pattern plate having pockets therein,some of said pockets being in the form of counterbored bores in saidpattern plate, said pattern plate being adapted to support a flask toreceive green sand under pressure, said bores having a resilient memberforming the bottom thereof, said resilient member being adapted to bedistorted when said sand is compressed in said flask and said pockets,said resilient member urging said sand from said pockets when said flaskwith said sand therein is removed.

3. The machine recited in claim 2 wherein said resilient member is inthe form of blocks of rubber.

4. The machine recited in claim 3 wherein said blocks of rubber aresandwiched between two rigid members.

5. A molding machine comprising a pattern plate, said pattern platehaving a generally flat top surface for supporting a flask, a flask onsaid pattern plate, and an up- Wardly facing pocket in said patternplate, said pocket having a block of resilient compressible materialtherein, said flask and said pattern plate being adapted to be supportedunder the head of said molding machine whereby sand is compressed insaid pocket and in said flask by means to compress said sand on saidmachine.

6. The machine recited in claim 5 wherein a roller conveyor for saidflask is provided, said conveyor having a row of rollers at each side ofsaid flask supporting said flask, and means on some of said rollers tolower said rollers with said flask onto said pattern plate and to liftsaid flask from said pattern plate.

References Cited by the Examiner UNITED STATES PATENTS Bogenschutz 22157Sudziarski 22157 LeBaron 22-157 :Ol'son, 221 3 Olson 2213 Snoeyenbos eta1. 22157 10 J. SPENCER OVERHOLSER, Primary Examiner.

MARCUS O. LYON'S, Examiner.

1. A MOLDING MACHINE COMPRISING A PATTERN PLATE HAVING POCKETS THEREIN,SAID PATTERN PLATE BEING ADAPTED TO SUPPORT A FLASH TO RECEIVE GREENSAND UNDER PRESSURE, SAID POCKETS HAVING A RESILIENT MEMBER FORMING APART OF THE BOTTOM THEREOF, SAID RESILIENT MEMBER BEING ADAPTED TO BEDISTORTED WHEN SAID SAID IS COMPRESSED IN SAID FLASK AND SAID POCKETS,SAID RESILIENT MEMBER URGING SAID SAND FROM SAID POCKETS WHEN SAID FLASKWITH SAID SAND THEREIN IS REMOVED.